If a + b + c =12, a + b = 4, and a + c = 7, what is the value of a2 ? [ যদি a + b + c =12, a + b = 4, এবং a + c = 7, হয় তবে a2 এর মান কত ? ]
Solution
Correct Answer: Option B
দেয়া আছে,
a + b + c =12, a + b = 4, এবং a + c = 7
∴ a + b + c = 12
=> 4 + c = 12
=> c = 12 - 4
∴ c = 8
আবার, a + c = 7
=> a + 8 = 7
=> a = 7 - 8
∴ a = -1
অতএব, a2 = ( -1 )2 = 1
a + b + c =12, a + b = 4, এবং a + c = 7
∴ a + b + c = 12
=> 4 + c = 12
=> c = 12 - 4
∴ c = 8
আবার, a + c = 7
=> a + 8 = 7
=> a = 7 - 8
∴ a = -1
অতএব, a2 = ( -1 )2 = 1
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